I have been able to flash back and forth and restore backups using CWM that I got from FreeGee. I haven't flashed any modems though. As always, YMMV
Edit: I think I've only restored one backup. I have flashed a lot this week...apologize
Sent from my LG-E980 using Tapatalk
e980 - i'd tell you which ROM, but then i'd have to update my signature thrice daily.